Answer: 7C+84Step-by-step explanation:Distributive property : a(b+c) = ab+ac , where a,b,c, are any expressions.Given : A restaurant uses C cups of flour for baking rolls and 12 cups of flour for baking pies.i.e. Number of cups of flour used for baking rolls per day = CNumber of cups of flour used for baking pies per day = 12Total flour used each day= C+12Now , total flour used in 7 days = 7 x (Total flour used each day)= 7 (C+12)= 7C +7 (12) [By distributive property]= 7C+84Hence, the expression for how much flour the restaurant uses in seven days : 7C+84